Good work on the most important stuff
You might consider adding a light source in the bunker behind the flag instead of a point light.
I'd prefer this, too. The lighting without any source looks a little bit strange.
Cool, you added KOTH. Also add a hill entity around the pillar, that the players can move a little bit. Otherwise it's too easy to kill the people who is sitting at the flag.
Add "message" "###" to the worldspawn.
The barrels are still too wide, so the top and bottom textures are misaligned. Use a diameter of 48 units for them.
Oh, and I agree with Chucki. The boxes that are cut off by the wall are looking bad.
Online @ [OTB] Beta!